Journal
INTERMETALLICS
Volume 93, Issue -, Pages 113-121Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.intermet.2017.11.018
Keywords
High entropy alloy; Surface mechanical attrition treatment; Microstructure; Hardness; Strengthening mechanism
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Funding
- Ministry of Science and Technology of Taiwan, ROC [MOST-105-2221-E-110-019-MY31]
- Metal Industries Research & Development Center
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Most high entropy alloys (HEAs) are cast to form single phase solid solution. Their hardness and strength at room temperature under the as-cast condition are typically lower than expectation. In the research, the ultrasonic surface mechanical attrition treatment (SMAT) is conducted on the surface of two HEAs, FeCoNiCrMn and FeCoNiCrMn-Al, to upgrade their room temperature surface characteristics. By proper SMAT multiple paths, the grain size can be reduced from similar to 50 mu m down to similar to 0.1-1 mu m, the hardness increased from similar to 2.5-5.0 GPa up to similar to 5.0-8.5 GPa, and the tensile strength and elongation can be nearly doubled. The gradient refined and strengthened surface layers are demonstrated to appreciably upgrade the HEA performance. The strengthening mechanisms and superposition rules are established and are compared well with the experimental measurements.
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